Hot water is not flowing from the ceiling electric hot water system to the whole house.

We have blocked the pipes/taps in our bath room to do the renovation. Now when we turn on the hot water taps there is only a small gush of hot water flowing from the bath tub. All the other hot water taps in the house is not running. The cold water taps throughout the house is working as per normal.

First question would be do you have a hot water recoversystem in your house?Second question would be where is the ceilg hot water system located in relation to your bath room? The last question would be do you have a shut off valve at the ceiling system?If it does start there you may have a blockage in the line .

Sounds like your path in that bath was the in and out for your heater. turn off the heater and allow it to cool down. reattach the pipes use t's and stubouts to where your valve or valves are now. liven it up slowly and turn the heater back on good luck